Drug interactions
Asenapine transdermal + Lapatinib
Severity: Moderate
Asenapine transdermal and Lapatinib: moderate interaction.
Last updated
For healthcare professionals — reference only. This page is a brief summary, not medical advice and not a substitute for official labeling or clinical judgement. Always verify before prescribing or dispensing.
Summary
Both drugs can prolong the QTc interval, so combined use may raise the risk of torsades de pointes. Transdermal asenapine is not marketed in all regions, and its QT effect is expected to be smaller than with other forms.
What this interaction means in plain words
Asenapine transdermal and Lapatinib can affect each other. The combination is often manageable, but it may need a change of dose, a change of timing, or extra checks while both are taken.
Why it happens
Additive QT prolongation.
What to do
Obtain a baseline ECG and monitor QTc and electrolytes. Choose an antipsychotic with less QT effect if the patient has other risk factors.
What to ask your pharmacist
- Should I take them at different times of day?
- Does the dose of either medicine need to change?
- Is there anything I should avoid, such as alcohol or certain foods, while on both?
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Other interactions of Lapatinib
- Dofetilide + Lapatinib Contraindicated
- Ibutilide + Lapatinib Contraindicated
- Lapatinib + Pimozide Contraindicated
- Lapatinib + Saquinavir Contraindicated
- Lapatinib + Thioridazine Contraindicated
- Adagrasib + Lapatinib Major
Frequently asked questions
Can I take Asenapine transdermal with Lapatinib?
MediHelp rates the interaction as moderate. Asenapine transdermal and Lapatinib can affect each other. The combination is often manageable, but it may need a change of dose, a change of timing, or extra checks while both are taken. Both drugs can prolong the QTc interval, so combined use may raise the risk of torsades de pointes. Transdermal asenapine is not marketed in all regions, and its QT effect is expected to be smaller than with other forms.
How serious is the interaction between Asenapine transdermal and Lapatinib?
MediHelp rates it moderate, on a four-level scale (minor, moderate, major, contraindicated) based on published labels and references. What to do, in brief: Obtain a baseline ECG and monitor QTc and electrolytes. Choose an antipsychotic with less QT effect if the patient has other risk factors.
What other medicines interact with Lapatinib?
MediHelp also lists interactions of Lapatinib with, for example, Dofetilide, Ibutilide, Pimozide. The full list is on the Lapatinib page.
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